Re: Hard disk slows linux system
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On Wednesday 14 May 2003 21:29, Kirk Strauser wrote:
> At 2003-05-14T17:17:07Z, Svein Ove Aas <svein.ove@aas.no> writes:
> > (On a sidenote, is there any need for HDs with lots of cache on a proper
> > OS, with DMA enabled, which caches stuff in the much more plentiful - not
> > to mention faster - main RAM anyway?)
>
> Yes. Especially when the cache is of the read-ahead sort where the drive
> fills a request by reading the given block plus the next several, and then
> committing the extra to cache for quick later retrieval regardless of where
> the head happens to have moved in the meantime.
But... the kernel does readahead already.
Look in /proc/sys/vm.
No matter how I look at it, I don't see how caching on the HD would be faster
than caching in main memory.
- --
No two persons ever read the same book.
-- Edmund Wilson
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